Thermocouple Wire Alloys for thermocouples, extension and compensating cables. Product range Nicrosil/Nisil (Type N) Thermothal P/Thermothal N (Type K) Thermothal P (EP)/Cuprothal (EN) (Type E) Copper/Cuprothal (TN) (TypeT) Iron/ (JP)/ Cuprothal (JN) (Type J) Cuprothal CL Thermocouple Compensating and Extension grade alloys